Digital camera

ABSTRACT

A digital camera in which a recording portion made up of a microcomputer  110  and a card slot  153  performs predetermined processing on image data generated by a CMOS sensor  130  so that the image data takes on the aspect ratio accepted via an operation portion  140  while in live view mode, or performs predetermined processing on the image data generated by the CMOS sensor  130  so that the image data takes on the aspect ratio of an optical viewfinder while in viewfinder mode. The image data is then stored in a memory card  300.  Through this configuration, it is possible to provide a digital camera in which an image of a composition that suits the user&#39;s intent can be recorded, as well as in which the image can be recorded having an aspect ratio that the user desires, selected from among a plurality of aspect ratios.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a digital camera, and particularlyrelates to a digital camera that includes a movable mirror and thatallows a subject image to be viewed through a digital viewfinder.

2. Description of Related Art

Digital single-lens reflex cameras include an electronic viewfinder andan optical viewfinder, and thus it is possible to switch a subject imageformed by an optical imaging system by a movable mirror and view thesubject image through the optical viewfinder. Therefore, noinconsistencies arise between the recorded subject image and the subjectimage displayed in the optical viewfinder, and imaging operations thuscan be performed in a satisfactory manner.

A digital single-lens reflex camera that includes a live view mode hasbeen disclosed in, for example, Patent Reference 1 (JP 2001-272593A).

Meanwhile, technology that changes the aspect ratio of an image bychanging the cutout range of the image data acquired from the imagingelements is being put into actual use. According to this technology, itis possible to record image data of various aspect ratios with a singleimaging apparatus.

However, when recording image data of an aspect ratio different from theaspect ratio of the optical viewfinder is also allowed in a mode inwhich a shot is composed using the optical viewfinder, the image seenwhen composing the shot will differ from the image recorded, and thusimage data that differs from what the user intended to capture will berecorded.

In order to prevent this from occurring, changing the aspect ratio ofthe optical viewfinder in accordance with the aspect ratio of therecorded image can be considered, but in order to implement such ascheme, it is necessary to provide an additional system for limiting thefield of view of the optical viewfinder.

SUMMARY OF THE INVENTION

Therefore, with the foregoing in mind, it is an object of the presentinvention to provide a digital camera that: includes a movable mirror,and also can perform a live view display of the subject image via anelectronic viewfinder; can record images of a composition that matches auser's intent using a simple system; and can record images of an aspectratio chosen from among a plurality of aspect ratios by the user.

The digital camera according to the present invention has a movablemirror arranged so as to be able to advance into and withdraw from theoptical path of an optical imaging system in order to conduct a subjectimage to an optical viewfinder, and comprises: an imaging element thatcaptures a subject image formed by the optical imaging system andgenerates image data; a display portion that displays the image based onthe generated image data; a control portion having a live view mode, inwhich control is performed so that the image based on the generatedimage data is displayed in the display portion in real time as a movingpicture, and a viewfinder mode, in which control is performed so thatthe movable mirror conducts the subject image to the optical viewfinder;an aspect ratio accepting portion that accepts an instruction regardingthe aspect ratio of an image; and a recording portion that performs,during the live view mode, predetermined processing on the image datagenerated by the imaging element so that the image data takes on theaspect ratio accepted by the aspect ratio accepting portion and storesthe image data in a storage medium, and performs, during the viewfindermode, predetermined processing on the image data generated by theimaging element so that the image data takes on the aspect ratio of theoptical viewfinder and stores the image data in the storage medium.

Through this, it is possible, during live view mode, to record an imageof an aspect ratio selected by a user from among a plurality of aspectratios. Because the aspect ratio of the image for recording is changedusing image processing technology, this can be implemented without theneed for a special mechanism. Meanwhile, during viewfinder mode, only animage of the aspect ratio of the optical viewfinder is recorded, andthus the aspect ratio of the image displayed in the optical viewfinderand the aspect ratio of the image for recording easily can be made tomatch. Accordingly, it is possible to record an image of a compositionthat matches the user's intent using a simple mechanism.

Therefore, according to this embodiment of the invention, it is possibleto provide a digital camera that can record an image having acomposition that matches the user's intent using a simple system, andcan record images of an aspect ratio chosen from among a plurality ofaspect ratios by the user.

In this case, the aspect ratio accepting portion may be configured so asto not accept instructions regarding the aspect ratio of the imageduring the viewfinder mode. Through this, it is possible easily to alertthe user that the aspect ratio cannot be changed during viewfinder mode.Furthermore, the value set for the aspect ratio in live view mode is notchanged while in viewfinder mode, and therefore it is possible to recordimage data using the previous settings when returning to live view mode.

Moreover, when moving from the live view mode to the viewfinder mode,the recording portion may switch from a state in which image data of theaspect ratio accepted by the aspect ratio accepting portion isrecordable to a state in which image data of the aspect ratio of theoptical viewfinder is recordable. Through this, it is possibleautomatically to cause the aspect ratios of the displayed image and therecorded image to match, even without the user being aware that thematching takes place.

Moreover, when moving from the viewfinder mode to the live view mode,the recording portion may switch from a state in which image data of theaspect ratio of the optical viewfinder is recordable to a state in whichimage data of the aspect ratio accepted by the aspect ratio acceptingportion before moving from the live view mode to the viewfinder mode isrecordable. Through this, the aspect ratio previously set in live viewmode can be maintained when returning to live view mode from viewfindermode, and therefore it is possible to prevent an aspect ratio switch theuser does not intent to occur.

According to the present invention as described above, it is possible toprovide a digital camera that can record an image having a compositionthat matches the user's intent using a simple system, and can recordimages of an aspect ratio from among a plurality of aspect ratiosselected by the user.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view showing an outline of a camera according toan embodiment of the present invention.

FIG. 2 is a block diagram showing the structure of a camera bodyaccording to an embodiment of the present invention.

FIG. 3 is a rear view of the camera body according to an embodiment ofthe present invention.

FIG. 4 is a block diagram showing the structure of an interchangeablelens according to an embodiment of the present invention.

FIG. 5 is a schematic view showing the interior of a mirror box of thecamera according to an embodiment of the present invention when theinterior is in a state B.

FIG. 6 is a schematic view showing the interior of the mirror box of thecamera according to an embodiment of the present invention when theinterior is in a state C.

FIG. 7 is a schematic view showing an example of an image displayedwhile in OVF mode.

FIGS. 8A to 8C are a schematic view showing an example of imagesdisplayed while in live view mode.

FIG. 9 is a flowchart illustrating a process for setting the aspectratio.

FIGS. 10A and 10B are a schematic view showing an example of a menuscreen in live view mode.

FIG. 11 is a schematic view showing an example of a menu screen in OVFmode.

FIG. 12 is a flowchart illustrating a process occurring at the time ofimaging using an optical viewfinder, while in manual focus mode.

FIG. 13 is a schematic view showing the structure of an image file thatcontains an image for recording.

FIG. 14 is a flowchart illustrating a process occurring at the time ofimaging using a liquid-crystal monitor 150, while in manual focus mode.

DETAILED DESCRIPTION OF THE INVENTION

Hereinafter, the present invention will be described by way of anillustrative embodiment with reference to the drawings.

[1. Configuration of the Digital Camera]

Hereinafter, the configuration of a camera 10 according to an embodimentof the present invention shall be described with reference to FIGS. 1through 6.

[1-1. Outline of the Overall Configuration]

FIG. 1 is a schematic view showing an outline of the camera 10. Thecamera 10 is configured of a camera body 100 and an interchangeable lens200, which can be attached/detached to/from the camera body 100.

The camera body 100 captures a subject image collected through anoptical system included within the interchangeable lens 200, and recordsthis as image data. The camera body 100 includes a mirror box 120 (seeFIG. 2). The mirror box 120 switches the optical path of the opticalsignal from the optical system included in the interchangeable lens 200in order to pass light of the subject image selectively into either of aComplementary Metal-Oxide Semiconductor (CMOS) sensor 130 or an eyepiece136. The mirror box 120 includes movable mirrors 121 a and 121 b, amirror driving portion 122, a shutter 123, a shutter driving portion124, a focusing glass 125, and a prism 126.

The movable mirror 121 a is arranged so as to be able to advance intoand withdraw from the optical path of the optical imaging system inorder to conduct the subject image to the optical viewfinder. Themovable mirror 121 b is arranged so as to be able to advance into andwithdraw from the optical path of the optical imaging system along withthe movable mirror 121 a. The movable mirror 121 b reflects part of theoptical signal inputted from the optical system included in theinterchangeable lens 200 into an Auto Focus (AF) sensor 132.

While the movable mirror 121 a is advanced into the optical path of theoptical imaging system, part of the optical signal inputted from theoptical system included in the interchangeable lens 200 enters theeyepiece 136 via the focusing glass 125 and the prism 126. Furthermore,the optical signal reflected by the movable mirror 121 a is diffused bythe focusing glass 125. Then, part of the diffused optical signal entersan auto exposure (AE) sensor 133. On the other hand, while the movablemirrors 121 a and 121 b are withdrawn from the optical path of theoptical imaging system, the optical signal inputted from the opticalsystem included in the interchangeable lens 200 enters the CMOS sensor130.

The mirror driving portion 122 is composed of mechanical components suchas motors, springs, and the like, and drives the movable mirrors 121 aand 121 b based on control performed by a microcomputer 110.

The shutters 123 a and 123 b switch between blocking the optical signalacquired from the interchangeable lens 200 and allowing the opticalsignal to pass. The shutter driving portion 124 is composed ofmechanical components such as motors, springs, and the like, and drivesthe shutters 123 a and 123 b based on control performed by themicrocomputer 110. It should be noted that the motors included in themirror driving portion 122 and the shutter driving portion 124 may bedifferent motors, or may be a single dual-purpose motor.

A liquid crystal monitor 150 is provided on the rear side of the camerabody 100. The liquid crystal monitor 150 is capable of displaying imagebased on image data generated by the CMOS sensor 130, or image based onimage data which the image data generated by the CMOS sensor 130 issubjected to a predetermined processing.

The optical system included in the interchangeable lens 200 includes anobjective lens 220, a zoom lens 230, a diaphragm 240, an imagestabilization unit 250, and a focus lens 260. A CPU 210 controls thisoptical system. The CPU 210 is capable of transmitting/receiving acontrol signal and information regarding the optical system to/from themicrocomputer 110 in the camera body 100.

[1-2. Configuration of the Camera Body]

FIG. 2 is a block diagram showing the configuration of the camera body100. As shown in FIG. 2, the camera body 100 has a number of portions,and is configured so that the microcomputer 110 controls those portions.However, although the present embodiment describes the microcomputer 110as controlling the entire camera body 100, it should be noted thatcontrol of the camera body 100 may be carried out by a plurality ofcontrol portions.

A lens mount portion 135 is a member that the interchangeable lens 200attaches to or detaches from. The lens mount portion 135 is electricallyconnectable to the interchangeable lens 200 via a connection terminal orthe like, and is also mechanically connectable via a mechanical membersuch as a latch or the like. The lens mount portion 135 is capable ofoutputting a signal from the interchangeable lens 200 to themicrocomputer 110, and is capable of outputting a signal from themicrocomputer 110 to the interchangeable lens 200. The lens mountportion 135 has a hollow structure. For this reason, the optical signalfrom the optical system included in the interchangeable lens 200 passesthrough the lens mount portion 135 and reaches the mirror box 120.

The mirror box 120 conducts the optical signal that has passed throughthe lens mount portion 135 to the CMOS sensor 130, the eyepiece 136, theAF sensor 132, and the AE sensor 133, in accordance with the internalstate of the mirror box 120. Switching of the optical signal by themirror box shall be described in the section “1-4. State of the MirrorBox”.

The CMOS sensor 130 converts the optical signal that has passed throughthe mirror box 120 and entered the CMOS sensor 130 into an electricalsignal and generates image data. The generated image data is convertedfrom an analog signal to a digital signal by an A/D converter 131 and isoutputted to the microcomputer 110. Note that predetermined imageprocessing may be performed while the generated image data is outputtedand en route from the CMOS sensor 130 to the A/D converter 131, whilethe image data is outputted and en route from the A/D converter 131 tothe microcomputer 110, and so on.

The eyepiece 136 transmits the optical signal that has passed throughthe mirror box 120. At this time, in the mirror box 120, the opticalsignal that entered from the interchangeable lens 200 is reflected bythe movable mirror 121 a, and the subject image is formed on thefocusing glass 125, as shown in FIG. 1. Then, the prism 126 reflectsthis subject image and emits the resultant to the eyepiece 136.Accordingly, the user can view the subject image emitted from the mirrorbox 120. Here, the eyepiece 136 may be configured of a single lens, ormay be configured of a lens group made up of a plurality of lenses. Inaddition, the eyepiece 136 may be held in a fixed position in the camerabody 100, or may be held in a mobile position for purposes of diopteradjustment or the like. The optical viewfinder, which is configured ofthe focusing glass 125, the prism 126, and the eyepiece 136, isoptimized for displaying images with compositions that utilize a 4:3aspect ratio. However, the optical viewfinder may be optimized fordisplaying images with compositions that utilize other aspect ratios.For example, the optical viewfinder may be optimized for displayingimages with compositions that utilize a 16:9 aspect ratio, and may beoptimized for displaying images with compositions that utilize a 3:2aspect ratio.

A protective material 138 protects the surface of the CMOS sensor 130.By providing the protective material 138 on the front side of the CMOSsensor 130, it is possible to prevent foreign objects such as dust fromcollecting on the surface of the CMOS sensor 130. The protectivematerial 138 may be formed of a transparent material such as glass orplastic.

An supersonic vibration generator 134 is activated in response to asignal from the microcomputer 110, and generates supersonic vibrations.The supersonic vibrations generated by the supersonic vibrationgenerator 134 are transmitted to the protective material 138. As aresult, the protective material 138 vibrates, making it possible toshake off foreign objects, such as dust, which have collected on theprotective material 138. The supersonic vibration generator 134 can berealized by, for example, attaching a piezoelectric element to theprotective material 138. In such a case, the piezoelectric elementattached to the protective material 138 can be caused to vibrate bysupplying an alternating current to the piezoelectric element.

A strobe 137 emits light in accordance with an instruction from themicrocomputer 110. The strobe 137 may be built into the camera body 100,or may be an attachable/detachable type. In the case of anattachable/detachable type flash, it is necessary to provide a flashmounting portion, such as a hot shoe, in the camera body 100.

A release button 141 accepts instructions regarding autofocusoperations, photometric operations, and the like from the user, as wellas accepting instructions regarding the commencement of capturing of theimage for recording by the CMOS sensor 130 from the user. The releasebutton 141 is compatible with operations in which the button isdepressed halfway, and operations in which the button is depressedfully. When the release button 141 is depressed halfway by the userwhile in autofocus mode, the microcomputer 110 instructs theinterchangeable lens 200 to perform autofocus operations based on asignal from the AF sensor 132. In addition, when the release button 141is depressed halfway by the user while in an automatic exposure mode,the microcomputer 110 instructs the interchangeable lens 200 to performphotometric automatic exposure operations based on a signal from the AEsensor 133. However, when the release button 141 is fully depressed bythe user, the microcomputer 110 controls the mirror box 120, the CMOSsensor 130, and the like, and captures the image for recording. Then,the microcomputer 110 performs YC conversion, resolution conversion,compression and the like as necessary on the captured image forrecording, thereby generating image data for recording. Themicrocomputer 110 stores the generated image data for recording in amemory card 300 via a card slot 153. In order to provide the releasebutton 141 with functionality for halfway depression operation and fulldepression operation, two switches, for example, can be built into therelease button 141. In such a case, one of the switches is turned onwhen the release button 141 is depressed halfway, and the other switchis turned on when the release button 141 is depressed fully.

An operation portion 140 is a member that transmits various instructionsfrom the user to the microcomputer 110. A rear view of the camera body100 is shown in FIG. 3 for the purpose of illustrating various operationmembers. The rear side of the camera body 100 includes a menu button 140a, a directional pad 140 b, a set button 140 c, a rotary dial 140 d, aviewfinder select switch 140 e, a focus mode select switch 140 f, aflash activation switch 140 h, an LV preview button 140 j, adepth-of-field preview button 140 k, an AV button 140 m, and a powersupply switch 142. An image stabilization mode select button 140 g andthe release button 141 are provided on the top surface of the camerabody 100.

The menu button 140 a causes setting information of the camera 10 to bedisplayed in the liquid crystal monitor 150, and is a button that makesit possible for the user to change the settings. The directional pad 140b is a button for selecting various settings, items, images, and thelike displayed in the liquid crystal monitor 150, and can, for example,cause a cursor or the like to move. The set button 140 c is a button forconfirming the various settings, items, images, and the like displayedin the liquid crystal monitor 150 after those settings, items, images,and the like have been selected. The rotary dial 140 d is an operationalmember that, like the directional pad 140 b, selects various settings,items, images, and the like displayed in the liquid crystal monitor 150,and can, for example, cause a cursor to move by being rotated. Theviewfinder select switch 140 e is a switch for selecting whether todisplay a captured image in the eyepiece 136 or the liquid crystalmonitor 150. The focus mode select switch 140 f is a switch forselecting whether to set the focus mode to manual focus mode orautofocus mode. The image stabilization mode select button 140 g is aswitch for selecting whether or not to use image stabilization, and forselecting which image stabilization mode to use. The depth-of-fieldpreview button 140 k is a button for adjusting the aperture in live viewmode. The LV preview button 140 j is a button that adjusts the apertureas well as enlarges part of the image displayed in the liquid crystalmonitor 150, while in live view mode. The AV button 140 m is a buttonfor adjusting the aperture in OVF mode.

Returning to FIG. 2, the liquid crystal monitor 150 receives a signalfrom the microcomputer 110 and displays images, information of varioussettings, and the like. The liquid crystal monitor 150 can display animage based on the image data generated by the CMOS sensor 130, or animage based on the image data in which the image data generated by theCMOS sensor 130 is subjected to a predetermined processing. The liquidcrystal monitor 150 can display an image obtained when the microcomputer110 performs a predetermined processing, such as expansion, as necessaryon the image data held in the memory card 300. The liquid crystalmonitor 150 is provided, as shown in FIG. 3, on the rear surface of thecamera body 100. The liquid crystal monitor 150 is provided on thecamera body 100 so as to be rotatable. A contact point 151 detectsrotation of the liquid crystal monitor 150. The liquid crystal monitor150 is optimal for displaying images having a composition in a 4:3aspect ratio. However, through control performed by the microcomputer110, the liquid crystal monitor 150 is capable of displaying imageshaving compositions in other aspect ratios (for example, 3:2 and 16:9).

An external terminal 152 is a terminal for outputting image data,various setting information, and the like to an external device. Theexternal terminal 152 is, for example, a Universal Serial Bus (USB)terminal, a terminal for an interface pursuant to an Institute ofElectrical and Electronic Engineers (IEEE 1394) specification, or thelike. In addition, when a connection terminal from an external deviceconnects to the external terminal 152, the external terminal 152notifies the microcomputer 110 of the connection.

A power supply controller 146 controls the members within the camera 10,such as the microcomputer 100, by supplying power from a battery 400,which is housed in a battery box 143, to those members. The power supplycontroller 146 starts supplying power from the battery 400 to themembers within the camera 10 when the power supply switch 142 is turnedon. In addition, the power supply controller 146 includes a sleepfunction; when the power of the camera 10 is on and no operations areperformed for a predetermined length of time, the power supplycontroller 146 stops the supply of power to the members within thecamera 10, with the exception of some members. Furthermore, the powersupply controller 146 notifies the microcomputer 110 that a batterycover 144 has been opened based on a signal from a contact point 145that monitors the opening/closing of the battery cover 144. The batterycover 144 is a member that allows the opening of the battery box 143 toopen and close. The power supply controller 146 is configured so as tosupply power to the various members within the camera 10 through themicrocomputer 110, as shown in FIG. 2; however, the power supplycontroller 146 may be configured so as to supply power directly, asnecessary.

A tripod fixing portion 147 is a member for fixing a tripod (not shown)to the camera body 100, and is configured of a screw or the like. Acontact point 148 monitors whether or not a tripod has been attached tothe tripod fixing portion 147, and notifies this to the microcomputer110. The contact point 148 can be configured of a switch or the like.

The card slot 153 is a connector for mounting the memory card 300. Thecard slot 153 may be configured so as to include a control portion forcontrolling the memory card 300 and/or software, rather than simplyhaving a mechanical structure for mounting the memory card 300.

A buffer 111 is a memory device used when the microcomputer 110processes signals. The data temporarily stored in the buffer 111 ismainly image data, but control signals and the like also may be storedin the buffer 111. The buffer 111 may be any means capable of storage,such as Dynamic Random Access Memory (DRAM), Static Random Access Memory(SRAM), flash memory, ferroelectric memory, or the like. The buffer 111may also be a specialized memory for storing images. In addition, theaspect ratio set by the user also is stored in the buffer 111. Duringlive view mode, the microcomputer 110 processes the image data so as totake on the aspect ratio stored in the buffer 111, and generates imagedata for display and image data for recording. On the other hand, duringOVF mode, the microcomputer 110 processes the image data so as to takeon the aspect ratio of the optical viewfinder regardless of the aspectratio stored in the buffer 111, and generates image data for display andimage data for recording.

An AF auxiliary light emitting portion 154 is a member that emitsauxiliary light when performing autofocus operation in a darkenvironment. The AF auxiliary light emitting portion 154 emits lightbased on control performed by the microcomputer 110. The AF auxiliarylight emitting portion 154 includes a red light-emitting diode (LED).

A remote control receiving portion 155 is a receiving portion thatreceives a signal from a remote controller (not shown) and transmits thereceived signal to the microcomputer 110. The remote control receivingportion 155 typically includes a light-receiving element that receivesinfrared light from the remote controller.

[1-3. Configuration of the Interchangeable Lens]

FIG. 4 is a block diagram showing a configuration of the interchangeablelens 200. The interchangeable lens 200 has an optical imaging system,and is configured so that the optical imaging system is controlled bythe CPU 210.

The CPU 210 controls the optical imaging system by controlling theactuator operations of a zoom motor 231, a diaphragm motor 241, an imagestabilization unit 250, a focus motor 261, and the like. The CPU 210sends information that indicates the status of the optical imagingsystem, an accessory placement portion 272, and the like to the camerabody 100 via a communication terminal 270. In addition, the CPU 210receives control signals and the like from the camera body 100, andcontrols the optical imaging system and the like based on the receivedcontrol signals.

The objective lens 220 is a lens positioned closest to the subject. Theobjective lens 220 may be movable along the optical axis, or may be in afixed position.

The zoom lens 230 is positioned further toward the image surface sidethan the objective lens 220. The zoom lens 230 is movable along theoptical axis. It is possible to change the magnification of the subjectimage by moving the zoom lens 230. The zoom lens 230 is driven by thezoom motor 231. The zoom motor 231 may be a stepper motor, a servomotor, or the like; any motor may be used as long as it can drive thezoom lens 230. The CPU 210 monitors the position of the zoom lens 230 bymonitoring the status of the zoom motor 231 or the status of othermembers.

The diaphragm 240 is positioned further toward the image surface sidethan the zoom lens 230. The diaphragm 240 has an aperture centered onthe optical axis. The aperture can be changed through the diaphragmmotor 241 and a diaphragm ring 242. The diaphragm motor 241 runs intandem with the mechanism for changing the aperture size of thediaphragm, and can change the aperture size of the diaphragm by drivingthis mechanism. In the same manner, the diaphragm ring 242 runs intandem with the mechanism for changing the aperture size of thediaphragm, and can change the aperture size of the diaphragm by drivingthis mechanism. The diaphragm motor 241 is provided with an electriccontrol signal by the microcomputer 110 or the CPU 210 via the user, andoperates in accordance with this control signal. On the other hand, thediaphragm ring 242 accepts mechanical operation from the user, andtransmits this operation to the diaphragm 240. Furthermore, it ispossible for the CPU 210 to detect whether or not the diaphragm ring 242has been operated.

The image stabilization unit 250 is positioned further toward the imagesurface side than the diaphragm 240. The image stabilization unit 250includes a stabilization lens 251 for image stabilization and anactuator for driving the stabilization lens 251. The actuator includedin the image stabilization unit 250 can move the stabilization lens 251on a plane orthogonal to the optical axis. A gyrosensor 252 measures theangular velocity of the interchangeable lens 200. For the sake ofsimplicity, the gyrosensor 252 is denoted as a single block in FIG. 4,but the interchangeable lens 200 actually includes two gyrosensors 252.One of the gyrosensors measures the angular velocity relative to thevertical axis of the camera 10. The other gyrosensor measures theangular velocity relative to the horizontal axis of the camera 10, whichis perpendicular to the optical axis. The CPU 210 measures the amountand direction of the movement of the interchangeable lens based onangular velocity information obtained from the gyrosensors 252. Then,the CPU 210 controls the actuator to move the stabilization lens 251 inthe direction that cancels out that amount of movement. Through this,the subject image formed by the optical imaging system of theinterchangeable lens 200 is stabilized.

A focus lens 260 is positioned furthest toward the image surface side.The focus motor 261 drives the focus lens 260 along the optical axis.Through this, the focus of the subject image can be adjusted.

The accessory placement portion 272 is a member for attaching anaccessory such as a lens hood to the front end of the interchangeablelens 200. The accessory placement portion 272 is configured of amechanism such as a screw, a bayonet, or the like. Furthermore, theaccessory placement portion 272 includes a detection device fordetecting whether or not an accessory is attached. When an accessory isattached, the accessory placement portion 272 notifies this to the CPU210.

[1-4. State of the Mirror Box]

The internal state of the mirror box 120 during various stages ofoperation shall be described with reference to FIGS. 1, 5, and 6.

FIG. 1 is a schematic view showing an internal state of the mirror box120 during a mode in which the subject image is being viewed using theoptical viewfinder. For the sake of simplicity, this state shall bereferred to as “state A” in this specification. In state A, the movablemirrors 121 a and 121 b advance into the optical path of the opticalsignal entering from the interchangeable lens 200. For this reason, partof the optical signal from the interchangeable lens 200 is reflected bythe movable mirror 121 a, while the remainder of the optical signal isallowed to pass. The reflected optical signal passes through thefocusing glass 125, the prism 126, and the eyepiece 136, and reaches theuser's eyes. Furthermore, the optical signal reflected by the movablemirror 121 a is reflected by the focusing glass 125, and part of thereflected signal passes into the AE sensor 133. On the other hand, partof the optical signal that penetrates the movable mirror 121 a isreflected by the movable mirror 121 b, and reaches the AF sensor 132. Inaddition, in state A, a first shutter 123 a is closed. For this reason,the optical signal from the interchangeable lens 200 does not reach theCMOS sensor 130. Therefore, while it is possible to view the subjectimage using the optical viewfinder, perform autofocus operations usingthe AF sensor 132, and perform photometric operations using the AEsensor 133 while in state A, it is not possible to view the subjectimage using the liquid crystal monitor 150, record the image datagenerated by the CMOS sensor 130, and perform autofocus operations usingthe contrast of the image data generated by the CMOS sensor 130 while instate A.

FIG. 5 is a schematic view showing an internal state of the mirror box120 during a mode in which the subject image is inputted into the CMOSsensor 130. For the sake of simplicity, this state shall be referred toas “state B” in this specification. In state B, the movable mirrors 121a and 121 b withdraw from the optical path of the optical signalentering from the interchangeable lens 200. For this reason, the opticalsignal from the interchangeable lens 200 does not pass through thefocusing glass 125, the prism 126, and the eyepiece 136, and does notreach the user's eyes, and furthermore does not reach the AF sensor 132or the AE sensor 133. In state B, the first shutter 123 a and a secondshutter 123 b are open. For this reason, the optical signal from theinterchangeable lens 200 reaches the CMOS sensor 130. Therefore, asopposed to state A, it is possible to view the subject image using theliquid crystal monitor 150, record the image data generated by the CMOSsensor 130, and perform autofocus operations using the contrast of theimage data generated by the CMOS sensor 130 while in state B; however,it is not possible to view the subject image using the opticalviewfinder, perform autofocus operations using the AF sensor 132, andperform photometric operations using the AE sensor 133 while in state B.Note that the movable mirrors 121 a and 121 b and the first shutter 123a are energized so as to move from state A to state B, through anenergizing portion such as a spring or the like. For this reason, it ispossible to move from state A to state B substantially instantly, whichis optimal for commencing exposure.

FIG. 6 is a schematic view showing an internal state of the mirror box120 immediately after exposure of the subject image to the CMOS sensor130 has finished. For the sake of simplicity, this state shall bereferred to as “state C” in this specification. In state C, the movablemirrors 121 a and 121 b withdraw from the optical path of the opticalsignal inputted from the interchangeable lens 200. For this reason, theoptical signal from the interchangeable lens 200 does not pass throughthe focusing glass 125, the prism 126, and the eyepiece 136, and doesnot reach the user's eyes, and furthermore does not reach the AF sensor132 or the AE sensor 133. Furthermore, in state C, the first shutter 123a is open, and the second shutter 123 b is closed. For this reason, theoptical signal from the interchangeable lens 200 does not reach the CMOSsensor 130. Therefore, it is not possible to view the subject imageusing the liquid crystal monitor 150, record the image data generated bythe CMOS sensor 130, perform autofocus operations using the contrast ofthe image data generated by the CMOS sensor 130, view the subject imageusing the optical viewfinder, perform autofocus operations using the AFsensor 132, and perform photometric operations using the AE sensor 133while in state C. The second shutter 123 b is energized in the closingdirection, and thus it is possible to move from state B to state Csubstantially instantly. For this reason, state C is an optimal statefor ending the exposure to the CMOS sensor 130.

As described above, the camera 10 moves directly from state A to stateB. However, due to the structural constraints of the mirror box 120, itis not possible to move from state B to state A without passing throughstate C. However, as this is a technical problem stemming from themechanism of the mirror box 120, a mechanism may be employed in which itis possible to move directly from state B to state A without passingthrough state C.

[1-5. Corresponding Elements between the Configuration of the PresentEmbodiment and the Configuration of the Present Invention]

A configuration that includes the focusing glass 125, the prism 126, andthe eyepiece 136 is one example of the optical viewfinder of the presentinvention. The optical system that includes the objective lens 220, thezoom lens 230, the corrective lens 251, and the focus lens 260 is oneexample of the optical imaging system of the present invention. Themovable mirrors 121 a and 121 b are examples of the movable mirrors ofthe present invention. The CMOS sensor 130 is an example of the imagingelement of the present invention. The liquid crystal monitor 150 is anexample of the display portion of the present invention. Themicrocomputer 110 is an example of the control portion of the presentinvention. In this case, the CPU 210 may be included as the controlportion in addition to the microcomputer 110. The buffer 111 is anexample of the storage portion of the present invention. The operationalportion including the menu button 140 a, the directional pad 140 b, theset button 140 c, and so on is an example of the aspect ratio acceptingportion of the present invention. The configuration made up of themicrocomputer 110 and the card slot 153 is an example of the recordingportion of the present invention. The memory card 300 is an example ofthe storage medium of the present invention.

[2. Operation of the Digital Camera]

Operation of the camera 10 according to the present embodiment of thepresent invention configured in the manner described above shall beexplained hereafter with reference to FIGS. 7 to 14.

[2-1. Operation for Displaying an Image in Real Time]

Display operation performed so that a subject image formed by theinterchangeable lens 200 can be viewed in real time shall be describedhereafter. Two operations are set as this display operation. The firstoperation utilizes the optical viewfinder, while the second operationutilizes the liquid crystal monitor 150. These operations each shall bedescribed in detail hereafter.

Note that in the present specification, the function and display fordisplaying the subject image in the liquid crystal monitor 150 in realtime are referred to as “live view”. In addition, the control mode ofthe microcomputer 110 during the live view operation is referred to as“live view mode”.

Live view is not particularly limited as long as it displays the subjectimage in the liquid crystal monitor 150 in real time; the image datadisplayed in the liquid crystal monitor 150 may or may not be stored ina storage portion such as the memory card 300 at this time.

In addition, while live view is being displayed, it is necessary toallow the optical signal from the interchangeable lens 200 to reach theCMOS sensor 130, and thus it is necessary for the internal state of themirror box 120 to be in state B, as shown in FIG. 5. However, it isnecessary for the internal state of the mirror box 120 to be put instates other than state B, such as state A and state C, in accordancewith other various states such as imaging operation, autofocusoperation, automatic exposure control operation, and so on; thus,periods arise in which the liquid crystal monitor 150 cannot perform thelive view display even when the microcomputer 110 is set to live viewmode.

Furthermore, as mentioned above, “live view” refers to displaying thesubject image in the liquid crystal monitor 150 in real time; however,the term “real time” should not be taken literally. A slight time delaybetween movement in the display and the actual movement of the subjectmay be present as long as the user essentially feels that the display isin real time. It is thought that the liquid crystal monitor 150 normallyoperates the live view display with a time delay of approximately 0.1seconds (depending on the hardware and the like of the camera 10, thismay be slightly longer or shorter); however, a delay of 1 to 5 secondsalso may be included in the concept of live view display as real-timedisplay of the subject.

[2-1-1. Operation During Use of the Optical Viewfinder]

The user can switch between live view mode and optical viewfinder mode(called OVF mode hereafter for the sake of simplicity) by sliding theviewfinder select switch 140 e shown in FIG. 3.

When the user slides the viewfinder select switch 140 e to the OVF modeside, the microcomputer 110 is set to OVF mode. At this time, themicrocomputer 110 controls the mirror driving portion 122 and theshutter driving portion 124, thereby putting the interior of the mirrorbox 120 into state A, as shown in FIG. 1. Through this, the user canview the subject image through the eyepiece 136 in real time. Inaddition, as mentioned earlier, autofocus operation utilizing the AFsensor 132 and photometric operation utilizing the AE sensor 133 arepossible in state A.

During OVF mode, the optical viewfinder only can display images in whichthe aspect ratio of the optical viewfinder is 4:3, as shown in FIG. 7.Also, as shall be mentioned later, the aspect ratio of the image datafor recording is compulsorily set to 4:3 during OVF mode. Accordingly,it is possible to ensure that the aspect ratio of the image at the timeof composition and the aspect ratio of the image recorded match, andthus it is possible to record an image compliant with the user's intentwithout providing an excess mechanism in the optical viewfinder.

[2-1-2. Operation During Use of the Liquid Crystal Monitor]

When the user slides the viewfinder select switch 140 e to the live viewmode side from the OVF mode side, the microcomputer 110 is set to liveview mode. At this time, the microcomputer 110 controls the mirrordriving portion 122 and the shutter driving portion 124, thereby puttingthe interior of the mirror box 120 into state B, as shown in FIG. 5.Through this, the user can view the subject image through the liquidcrystal monitor 150 in real time.

During real-time viewing, a subject image that has passed through themirror box 120 and into the CMOS sensor 130 is converted into imagedata. That image data is inputted into the microcomputer 110 via the A/Dconverter 131; the microcomputer 110 performs predetermined processingon the image data.

At this time, the microcomputer 110 processes the image data so that theaspect ratio of the image data becomes the same as the aspect ratiostored in the buffer 111. The image data processed in this manner isdisplayed in the liquid crystal monitor 150 as shown in FIGS. 8A to 8C.In other words, when the aspect ratio is set to 4:3, an image with anaspect ratio of 4:3, such as that shown in FIG. 8A, is displayed; whenthe aspect ratio is set to 3:2, an image with an aspect ratio of 3:2,such as that shown in FIG. 8B, is displayed; and when the aspect ratiois set to 16:9, an image with an aspect ratio of 16:9, such as thatshown in FIG. 8C, is displayed.

In addition, when recording image data in live view mode, themicrocomputer 110 processes the image data so that the aspect ratio ofthe image data becomes the same as the aspect ratio stored in the buffer111. The image data then is stored in the memory card 300. In otherwords, when the aspect ratio is set to 4:3, the memory card 300 storesan image with an aspect ratio of 4:3, as shown in FIG. 8A; when theaspect ratio is set to 3:2, the memory card 300 stores an image with anaspect ratio of 3:2, as shown in FIG. 8B; and when the aspect ratio isset to 16:9, the memory card 300 stores an image with an aspect ratio of16:9, as shown in FIG. 8C.

Accordingly, it is possible to ensure, even in live view mode, that theaspect ratio of the image at the time of composition and the aspectratio of the image recorded match, and thus it is possible to record animage compliant with the user's intent without providing an excessmechanism in the optical viewfinder. Furthermore, in live view mode, itis possible to select an aspect ratio from among a plurality of aspectratios and record the image so that it corresponds to the selectedaspect ratio.

[2-2. Method for Setting the Aspect Ratio]

A process for setting the aspect ratio of the image for recording shallbe described hereafter with reference to FIGS. 9 to 11. FIG. 9 is aflowchart explaining a process for setting the aspect ratio of the imagefor recording. FIGS. 10A and 10B are a schematic view showing a menuscreen in live view mode. FIG. 11 is a schematic view showing a menuscreen in OVF mode.

In FIG. 9, when the user presses the menu button 140 a (Yes, S901), themicrocomputer 110 judges whether the currently-set mode is live viewmode or OVF mode (S902).

When the results show that live view mode is currently set, themicrocomputer 110 reads out the value set for the aspect ratio from thebuffer 111 (S903). Here, the value set for the aspect ratio is assumedto be “3:2.” Next, the microcomputer 110 reads out other data necessaryfor displaying the menu from the buffer 111, and displays the menuscreen shown in FIG. 10A in the liquid crystal monitor 150. As can beseen in FIG. 10A, the microcomputer 110 displays the value of “3.2” readout from the buffer 111 in the menu screen (S904). The value set for theaspect ratio can be changed through user operations. To be morespecific, when the user presses the up/down buttons of the directionalpad 140 b while the menu screen shown in FIG. 10A is being displayed bythe liquid crystal monitor 150, the cursor displayed in the menu screenmoves up/down, and thus it is possible to place the cursor on the“aspect ratio” item. When the cursor is placed on the “aspect ratio”item, the menu screen changes in the manner shown in FIG. 10B, and allvalues that can be set for the aspect ratio are displayed. The user thenplaces the cursor on the aspect ratio s/he desires from among the aspectratios displayed, and presses the set button 140 c. Upon doing so, theaspect ratio is set to the user's desired aspect ratio, and the aspectratio value in the buffer 111 is overwritten.

On the other hand, when in OVF mode, the microcomputer 110 displays themenu screen shown in FIG. 11 in the liquid crystal monitor 150 (S905).The “aspect ratio” item is not displayed in this menu screen from thebeginning, and the value set for the aspect ratio cannot be changed.

In this manner, information regarding the aspect ratio stored within thebuffer 111 can be changed only while in live view mode. In addition, asshall be described later, image data for recording is generated inaccordance with the aspect ratio stored within the buffer 111 while inlive view mode, whereas image data for recording is generated to havethe same aspect ratio as the optical viewfinder regardless of the aspectratio stored in the buffer 111 while in OVF mode. Accordingly, whenmoving from live view mode to viewfinder mode, it is possible to switchautomatically from a state in which image data of an aspect ratio set bythe user can be recorded to a state in which image data of the aspectratio of the optical viewfinder can be recorded. Furthermore, whenmoving from viewfinder mode to live view mode, it is possible to switchautomatically from a state in which image data of the aspect ratio ofthe optical viewfinder can recorded to a state in which image data ofthe aspect ratio set by the user before moving from live view mode toviewfinder mode can be recorded.

[2-3. Operations for Capturing an Image for Recording]

Next, operations for capturing an image for recording shall be explainedwith reference to FIGS. 12 to 14. Focusing systems used in capturing animage for recording include a manual focus system, a single focussystem, and a continuous focus system; however, the manual focus systemshall be used in the example shown hereafter. Note, though, that thepresent invention is applicable even if another focusing system is used.

The manual focus system is a system in which the focus changes inresponse to the user manipulating a focusing ring 262, whereby the focuscan be set to the user's preference. However, the manual focus systemhas a problem in that bringing the subject into focus is difficult ifthe user is not accustomed to focusing the camera manually. Hereafter,descriptions shall be provided regarding the case of capturing an imageusing the optical viewfinder and the case of capturing an image usingthe liquid crystal monitor 150, with reference to FIGS. 12 and 14.

[2-3-1. Operations for Imaging using the Optical Viewfinder]

FIG. 12 is a flowchart illustrating a process occurring at the time ofimaging using the optical viewfinder, while in manual focus mode.

In the case of imaging while in OVF mode, the interior of the mirror box120 is in state A shown in FIG. 1. Prior to imaging, the user checks thesubject image through the eyepiece 136, brings the subject into focus,and checks the composition. At this time, the aspect ratio of thesubject image displayed in the optical viewfinder is 4:3. The usermanipulates the focusing ring 262 to bring the subject into focus(S1201). In parallel with this, the microcomputer 110 monitors whetheror not the release button 141 has been fully depressed (S1202).

In the case where the microcomputer 110 detects that the release button141 has been fully depressed, the microcomputer 110 controls the mirrordriving portion 122 and the shutter driving portion 124, thereby puttingthe interior of the mirror box 120 from state A into state B (S1203). Inthis state, the microcomputer 110 exposes the CMOS sensor 130 to theoptical signal from the interchangeable lens 200, and causes an imagefor recording to be captured (S1204). Then, when the amount of timecorresponding to the shutter speed has passed, the microcomputer 110controls the shutter driving portion 124 to close the second shutter 123b, thereby ending the exposure (state C). After this, the microcomputer110 returns the interior of the mirror box 120 to state A (S1205).

The microcomputer 110 takes the image data generated by the CMOS sensor130 and temporarily stores the image data in the buffer 111. The imagedata stored at this time is, for example, image data composed of RGBcomponents. The microcomputer 110 performs predetermined imageprocessing on the image data stored in the buffer 111, such as YCconversion, resizing, compression, and the like, thereby generatingimage data for recording (S1206). At this time, the image data forrecording is processed so as to have an aspect ratio of 4:3 regardlessof the aspect ratio stored in the buffer 111. Finally, the microcomputer110 generates an image file in, for example, the Exchangeable Image FileFormat (EXIF) standard. The microcomputer 110 stores the generated imagefile in the memory card 300 via the card slot 153.

Here, descriptions shall be provided regarding the image file that themicrocomputer 110 ultimately generates. FIG. 13 is a schematic viewshowing the structure of this image file. The image file includes aheader portion D1 and an image data portion D2. Image data for recordingis stored in the image data portion D2. The header portion D1 includes avarious settings storage portion D1 and a thumbnail image D12. Thevarious settings storage portion D11 includes a plurality of storageareas in which various settings, including imaging conditions such asexposure conditions, white balance conditions, and imaging data, arestored. A finder mode information storage portion D111 is present in oneof those storage areas. The finder mode information storage portion D111stores either “LV” or “OVF” as information. When the microcomputer 110performs imaging operations while live view mode is set, “LV” is storedin the finder mode information storage portion D111 of the image filegenerated as a result of the imaging. On the other hand, when themicrocomputer 110 performs imaging operations while OVF mode is set,“OVF” is stored in the finder mode information storage portion D111 ofthe image file generated as a result of the imaging. Through this,whether the image data in the generated image file was generated in liveview mode or in OVF mode can be determined easily by analyzing theheader portion D1 of the image file. Through this, the user canunderstand the relationship between the quality of the image s/he tookand the finder mode, which can be useful for improving his/herphotographic technique.

In addition, the header portion D1 stores the number of vertical andhorizontal pixels of the image data. Therefore, the aspect ratio of theimage data can be determined easily by analyzing the header portion D1.However, information indicating the aspect ratio may be stored as well,in addition to or in place of the pixel numbers. This allows the aspectratio of the image data to be determined more directly or easily.

[2-3-2. Operations for Imaging Using the Liquid Crystal Monitor]

FIG. 14 is a flowchart explaining a process occurring at the time ofimaging using a liquid-crystal monitor 150, while in manual focus mode.

In the case of imaging while in live view mode, the interior of themirror box 120 is in state B shown in FIG. 1. Prior to imaging, the userchecks the subject image through the liquid crystal monitor 150, bringsthe subject into focus, and checks the composition. At this time, themicrocomputer 110 processes the image data received from the A/Dconverter 131 so that the aspect ratio of the image data becomes thesame as the aspect ratio stored in the buffer 111, and displays imagebased on the image data in the liquid crystal monitor 150. The usermanipulates the focusing ring 262 to bring the subject into focus(S1401). In parallel with this, the microcomputer 110 monitors whetheror not the release button 141 has been depressed fully (S1402).

In the case where the microcomputer 110 detects that the release button141 has been depressed fully, the microcomputer 110 controls the mirrordriving portion 122 and the shutter driving portion 124, thereby puttingthe interior of the mirror box 120 from state B into state A via state C(S1403). The interior of the mirror box 120 is temporarily put intostate A in this manner so as to temporarily interrupt, via the shutter123, the optical signal inputted to the CMOS sensor 130, and allow theCMOS sensor 130 to prepare for exposure. The elimination of unnecessaryelectrical load in the pixels can be given as an example of preparationfor exposure.

The processes indicated in steps S1404 to S1406 are identical to theprocesses indicated in the abovementioned steps S1203 to S1205, and thusdescriptions thereof shall be omitted.

When exposure ends and the interior of the mirror box 120 reaches stateA (S1406), the microcomputer 110 once again returns the interior of themirror box 120 to state B, and resumes the live view display (S1407). Inparallel with this, the microcomputer 110 takes the image data generatedby the CMOS sensor 130 and temporarily stores the image data in thebuffer 111. The image data stored at this time is, for example, imagedata composed of RGB components. The microcomputer 110 performspredetermined image processing on the image data stored in the buffer111, such as YC conversion, resizing, compression, and the like, therebygenerating image data for recording (S1408). At this time, the imagedata for recording is processed so as to have the same aspect ratio asthe aspect ratio stored in the buffer 111. The microcomputer 110ultimately generates a file of, for example, the EXIF standard. Themicrocomputer 110 stores the generated image file in the memory card 300via the card slot 153 (1409).

[3. Conclusion]

The digital camera 10 according to the present invention is a digitalcamera that has movable mirrors 121 a and 121 b, which are arranged soas to be able to advance into and withdraw from the optical path of theoptical imaging system in order to conduct the subject image to theoptical viewfinder. The digital camera 10 includes a CMOS sensor 130, aliquid crystal monitor 150, a microcomputer 110, an operation portion140, and a card slot 153. The CMOS sensor 130 captures a subject imageformed by an optical imaging system and generates image data. The liquidcrystal monitor 150 displays image based on the generated image data orimage based on the image data on which a predetermined processing hasbeen performed. The microcomputer 110 has a live view mode, in whichcontrol is performed so that the generated image data or the image dataon which the predetermined processing has been performed is displayed inthe liquid crystal monitor 150 as a moving image in real time, and aviewfinder mode, in which control is performed so that the movablemirrors 121 a and 121 b conduct the subject image to an opticalviewfinder. The operation portion 140 accepts instructions regarding theaspect ratio of the image. The recording portion configured of themicrocomputer 110 and the card slot 153 performs a predeterminedprocessing on the image data generated by the CMOS sensor 130 so thatthe image data takes on the aspect ratio accepted via the operationportion 140 while in live view mode, or performs a predeterminedprocessing on the image data generated by the CMOS sensor 130 so thatthe image data takes on the aspect ratio of the optical viewfinder whilein viewfinder mode; then, the image data is stored in the memory card300.

Through this, it is possible, during live view mode, to store an imageof an aspect ratio chosen by the user from among a plurality of aspectratios. Because the aspect ratio of the image to be recorded is changedusing image processing technology, this can be implemented without theneed for a special configuration. On the other hand, during viewfindermode, only an image of the aspect ratio of the optical viewfinder isstored, and thus the aspect ratio of the image displayed in the opticalviewfinder and the aspect ratio of the image to be recorded can easilybe made to match. Accordingly, it is possible to store an image of acomposition that matches the user's intent using a simple system.

Therefore, according to the present embodiment of the invention, it ispossible to provide a digital camera that can store images of acomposition that matches the user's intent using a simple system, andcan store images of an aspect ratio chosen by the user from among aplurality of aspect ratios.

In addition, in the present embodiment of the invention, the item “imageaspect ratio”, which is used to change the aspect ratio, is notdisplayed while in viewfinder mode. For this reason, the operationportion 140 does not accept instructions regarding the aspect ratio ofthe image while in viewfinder mode. Therefore, it is possible easily toalert the user that the aspect ratio cannot be changed during OVF mode.Furthermore, the value set for the aspect ratio during live view modecannot be changed while in OVF mode, and thus it is possible, uponreturning to live view mode, to record the image data using the previoussettings.

In addition, in the present embodiment of the invention, the recordingportion configured of the microcomputer 110 and the card slot 153switches from a state in which image data with the aspect ratio acceptedvia the operation portion 140 can be recorded to a state in which imagedata with the aspect ratio of the optical viewfinder can be recorded,when the mode is switched from live view mode to viewfinder mode.Through this, it is possible to automatically match the aspect ratios ofthe displayed image and the recorded image, even without the user beingaware that the matching has taken place.

In addition, in the present embodiment of the invention, the recordingportion configured of the microcomputer 110 and the card slot 153switches from a state in which image data with the aspect ratio of theoptical viewfinder can be recorded to a state in which image data withthe aspect ratio accepted via the operation portion 140 prior to theswitch from live view mode to viewfinder mode, when the mode is switchedfrom viewfinder mode to live view mode. Through this, the aspect ratioset in live view mode can be maintained when returning to live view modefrom OVF mode, and therefore it is possible to prevent an aspect ratioswitch the user does not intent to occur.

It should be noted that in the present embodiment of the invention,although the item “image aspect ratio”, which is used to change theaspect ratio, is not displayed while in viewfinder mode, the presentinvention is not limited to such a configuration. For example, the“image aspect ratio” item may be displayed while in viewfinder mode aswell, while the value set for the aspect ratio displayed therein simplycannot be changed. In other words, the operation portion 140 may beconfigured so as not to accept instructions regarding the aspect ratioof the image while in viewfinder mode.

The present invention is applicable to a digital camera that includes amovable mirror and with which a subject image can be viewed through anelectronic viewfinder. For example, the present invention is applicableto a digital single-lens reflex camera. Moreover, the present inventionis applicable not only to a camera that captures still images, but alsoto a camera that can capture moving images.

The invention may be embodied in other forms without departing from thespirit or essential characteristics thereof. The embodiments disclosedin this application are to be considered in all respects as illustrativeand not limiting. The scope of the invention is indicated by theappended claims rather than by the foregoing description, and allchanges which come within the meaning and range of equivalency of theclaims are intended to be embraced therein.

1. A digital camera having a movable mirror arranged so as to be able toadvance into and withdraw from the optical path of an optical imagingsystem in order to conduct a subject image to an optical viewfinder, thedigital camera comprising: an imaging element that captures a subjectimage formed by the optical imaging system and generates image data; adisplay portion that displays the image based on the generated imagedata; a control portion having a live view mode, in which control isperformed so that the image based on the generated image data isdisplayed in the display portion in real time as a moving picture, and aviewfinder mode, in which control is performed so that the movablemirror conducts the subject image to the optical viewfinder; an aspectratio accepting portion that accepts an instruction regarding the aspectratio of an image; and a recording portion that performs, during thelive view mode, predetermined processing on the image data generated bythe imaging element so that the image data takes on the aspect ratioaccepted by the aspect ratio accepting portion and stores the image datain a storage medium, and performs, during the viewfinder mode,predetermined processing on the image data generated by the imagingelement so that the image data takes on the aspect ratio of the opticalviewfinder and stores the image data in the storage medium.
 2. Thedigital camera according to claim 1, wherein the aspect ratio acceptingportion does not accept instructions regarding the aspect ratio of theimage during the viewfinder mode.
 3. The digital camera according toclaim 1, wherein when moving from the live view mode to the viewfindermode, the recording portion switches from a state in which image data ofthe aspect ratio accepted by the aspect ratio accepting portion isrecordable to a state in which image data of the aspect ratio of theoptical viewfinder is recordable.
 4. The digital camera according toclaim 3, wherein when moving from the viewfinder mode to the live viewmode, the recording portion switches from a state in which image data ofthe aspect ratio of the optical viewfinder is recordable to a state inwhich image data of the aspect ratio accepted by the aspect ratioaccepting portion before moving from the live view mode to theviewfinder mode is recordable.